DTC 9-4

DTC 9-4: Faulty Front Passenger's Seat Belt Buckle Switch

1. Erase the DTC memory.

2. Turn the ignition switch ON (II), then buckle and unbuckle the front passenger's seat belt several times.

3. Read the DTC.

Is DTC 9-4 indicated?

YES - Go to step 4.

NO - Intermittent failure, system is OK at this time. Go to Troubleshooting Intermittent Failures.

4. Turn the ignition switch OFF.






5. Disconnect the front passenger's seat belt buckle switch 3P connector (A) from the passenger's power seat wire harness 3P connector (B).






6. Buckle the front passenger's seat belt.

Check resistance between the No.1 and No.3 terminals of the front passenger's seat belt buckle switch 3P connector. There should be 0 - 1 Ohm.

Check resistance between the No.1 and No.2 terminals of the same connector. There should be 1 MOhm or more.

Are the resistance readings as specified?

YES - Go to step 7.

NO - Replace the front passenger's seat belt buckle assembly, and clear the DTC.






7. Unbuckle the front passenger's seat belt.

Check resistance between the No.1 and No.2 terminals of the front passenger's seat belt buckle switch 3P connector. There should be 0 - 1 Ohm.

Check resistance between the No.1 and No.3 terminals of the same connector. There should be 1 M Ohm or more.

Are the resistance readings as specified?

YES - Go to steps.

NO - Replace the front passenger's seat belt buckle assembly, and clear the DTC.






8. Check resistance between the No.1 terminal of the passenger's power seat wire harness 3P connector (with power seat) or right side wire harness 3P connector (without power seat) and body ground. There should be 0 - 1 Ohm.

Is the resistance reading as specified?

YES - Go to step 9.

NO - Open in the passenger's power seat wire harness (with power seat), open in the right side wire harness, or poor ground connection at G581. If G581 is OK, replace the faulty harness.

9. Disconnect the negative cable from the battery. Disconnect the dashboard wire harness ASP connector from the SRS unit.






10. Check resistance between the No.2 terminal of the passenger's power seat wire harness 3P connector (with power seat) or right side wire harness 3P connector (without power seat) and body ground. There should be 1 M Ohm or more.

Is the resistance reading as specified?

YES - Go to step 11.

NO - Short to ground in dashboard wire harness A, right side wire harness, or passenger's power seat wire harness (with power seat). Replace the faulty harness.






11. Check resistance between the No.3 terminal of the passenger's seat wire harness 3P connector and body ground. There should be 1 M Ohm or more.

Is the resistance reading as specified?

YES - Go to step 12.

NO - Short to ground in the dashboard wire harness A, right side wire harness or passenger's power seat wire harness (with power seat). Isolate the faulty harness, and replace as necessary.






12. Check resistance between the No.7 terminal of SRS unit connector C (8P) and the No.3 terminal of the passenger's seat wire harness 3P connector. There should be 0 - 1 Ohm.

Is the resistance reading as specified?

YES - Go to step 13.

NO - Open in the dashboard wire harness A, right side wire harness, or passenger 5 seat wire harness. Isolate the faulty harness, and replace as necessary.






13. Check resistance between the No.3 terminal of SRS unit connector C (8P) and the No.2 terminal of the passenger's seat wire harness 3P connector. There should be 0 - 1 Ohm.

Is the resistance as specified?

YES - Replace the SRS unit.

NO - Open in the dashboard wire harness A, right side wire harness, or passenger's seat wire harness. Isolate the faulty harness, and replace as necessary.